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Letters Paten-t'No. 67,608, dated August 6, 1867.

IMPROVEMENT IN BOILER WATER-GAUGBS.

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TO ALL WHOMIT MAY CONCERN:

Be it known that I, DAVID M. SWAIN,`of La Crosse, in the county of La Crosse, and State of lrVisconsin, have invented a new and useful Improvement in Water-Gauges; and I do hereby declare and make known that the following is a full, clear, `and exact description of the same, reference being had to the accompanying drawings, and the letters and gures marked thereon, which form part of this specification.

My invention consists in a. novel arrangement of mechanical devices whereby the engineer or others can readilyascertain the height to which the water rises in the boiler by-inspeeting a dial-face, or by the sound of a whistle when the Water is down as low as is compatible with safety, so that water may be seasonably introduced into theiboiler, thereby preventing explosions.

To enable those skilled in the art to understand how to construct and use my invention,.I will proceed to describe the saule with particularity, reference being made to the aforesaid drawings, in Which- Figure 1 represents a front elevation of my invention.

Figure 2, a side elevation of the same, and e Figure 3 a rear view, the plate K being removed.

Similar letters of reference in the several figures denote the saine parts of my invention.

The gauge-face or dial is arranged upon the boiler, the tube E passing through the boiler-plate into the boiler. A represents a hollow water-tight metallic globe, which rests upon the surface of the water, and has attached thereto Aan arm, B, which screws into a bar, C, which is suspended in the support D by means of the pivots a a upon said bar andthe set-screw c. If preferred thc arm B and bar C may be of asingle piece. By suspending or pivoting the arm B C upon the prolonged points a, there is much less liability of the parts becoming fixed from incrustation or deposit upon the joint than when suspended in the usual manner, and the ordinary guids for the end of the bar 'C are also dispensed with. To the rear end of VC is connecte-d a rod, F, which passes loosely up through the tube E into a chamber, J, which is rendered steam-tight in any suitable manner,

where the upper end of said rod is attached to an arm, G, projecting a suitable length, as shown, from a shaft,

b, which passes through to the front, as shown, where there is attached a toothed segment, d. The pointer is attached to a separate shaft, upon which is attached a pinion, e, which gears into the said toothed segment upon the shaft I, as seen in fig. 1. S represents a coil spring, which isi attached to the shaft upon which the pointer B is arranged in such a manner as toihold the teeth of the pinion firmly against the teeth of the segment,'so that all lost motion is avoided, and the movement of the pointer insured at the slightest variation-in the position of the float. Upon the shaft bis lxedran arm, H, which, as the oat sinks, is brought in contact with a shoulder, I, which opens the port in the whistle, when the-steam from the chamber J enters and sounds the whistle.

Having described the construction and operation of my invention, I will now specify whatI claim andV desire to secure by Letters Patent I-claim the oat A and its arm, the supports D, rod F, arm G, shaft b, segment d, pinion e, pointer P,

spring S, arm II, and shoulder I, arranged and operating substantially in the manner vand for' the purposes specified.

DAVID M. SWAIN.

Witnesses:

THOMAS R. JACKSON, M. K'. AVERY. 

